Question

In triangle ABC , angle B=90and AB= 3 cm and BC= 4 cm FIND AC

Answer 1

use Pythagoras theorem

ab^2+bc^2=ac^2

3^2+4^2=ac^2

ac^2=25

ac=√25=5

hence ac =5cm

Answer 2

in ∆ABC

angle ABC=90°

by Pythagorean theorem

Ac square=AB square+BC square